PDF malware analysis — malicious · 238e0998d7fc350c

MALICIOUS

PDF

4.4 KB

MD5: cb35f024c600caa6af5bf78a4d2e088c SHA-1: 1a2633b86dd85fd2a6f247a8c9931200ed70fddf SHA-256: 238e0998d7fc350c84c4467d8a4b87c5b68b243b994ebd146e807bbe09ca9101

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical finding is the CVE-2008-2992 exploit, which uses `util.printf` and `eval()` on a string constructed from character codes. This technique is commonly used to bypass security measures and execute arbitrary code. The deobfuscated JavaScript stream suggests the primary goal is to download and execute a secondary payload. No specific family could be identified.

Heuristics 6

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `2d3120526346aadcc7e2d706ad7d589ffdf52902744ff26b2b6ebf975d7a47c3`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	24005 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `b3006e59459d43552e5ef0837b3e53b68b5b96d4d0699fa01935261a47a07d5b`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	7056 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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